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   "source": [
    "# 1. Fill the missing pieces of the `count_even_numbers` function\n",
    "Fill `____` pieces of the `count_even_numbers` implemention in order to pass the assertions. You can assume that `numbers` argument is a list of integers."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "____ count_even_numbers(numbers):\n",
    "    count = 0\n",
    "    for num in ____:\n",
    "        if ____ % 2 == ____:\n",
    "            count += ____\n",
    "    _____ _____"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "editable": false
   },
   "outputs": [],
   "source": [
    "assert count_even_numbers([1, 2, 3, 4, 5, 6]) == 3\n",
    "assert count_even_numbers([1, 3, 5, 7]) == 0\n",
    "assert count_even_numbers([-2, 2, -10, 8]) == 4"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# 2. Searching for wanted people\n",
    "Implement `find_wanted_people` function which takes a list of names (strings) as argument. The function should return a list of names which are present both in `WANTED_PEOPLE` and in the name list given as argument to the function."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "editable": false
   },
   "outputs": [],
   "source": [
    "WANTED_PEOPLE = ['John Doe', 'Clint Eastwood', 'Chuck Norris']"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Your implementation here"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "editable": false
   },
   "outputs": [],
   "source": [
    "people_to_check1 = ['Donald Duck', 'Clint Eastwood', 'John Doe', 'Barack Obama']\n",
    "wanted1 = find_wanted_people(people_to_check1)\n",
    "assert len(wanted1) == 2\n",
    "assert 'John Doe' in wanted1\n",
    "assert 'Clint Eastwood'in wanted1\n",
    "\n",
    "people_to_check2 = ['Donald Duck', 'Mickey Mouse', 'Zorro', 'Superman', 'Robin Hood']\n",
    "wanted2 = find_wanted_people(people_to_check2)\n",
    "assert wanted2 == []"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# 3. Counting average length of words in a sentence\n",
    "Create a function `average_length_of_words` which takes a string as an argument and returns the average length of the words in the string. You can assume that there is a single space between each word and that the input does not have punctuation. The result should be rounded to one decimal place (hint: see [`round`](https://docs.python.org/3/library/functions.html#round))."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Your implementation here"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "editable": false
   },
   "outputs": [],
   "source": [
    "assert average_length_of_words('only four lett erwo rdss') == 4\n",
    "assert average_length_of_words('one two three') == 3.7\n",
    "assert average_length_of_words('one two three four') == 3.8\n",
    "assert average_length_of_words('') == 0"
   ]
  }
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